Original contributionExpression of PC-cell-derived growth factor in benign and malignant human breast epithelium☆
Section snippets
Tissue samples
Two hundred six nonconsecutive archival formalin-fixed, paraffin-embedded human breast lesions from 152 patients were obtained from the University of Maryland Department of Pathology files and from the National Cancer Institute of Canada-Manitoba Breast Cancer Tumor Bank of the University of Manitoba, Winnipeg, Canada (kindly provided by Dr. Peter Watson). The 152 tissue blocks examined contained the following lesions: 27 ductal carcinoma in situ (DCIS), 12 lobular carcinoma in situ (LCIS), 124
PCDGF expression in human breast tissue and its association with histologic type
PCDGF expression was observed in 128 of 206 cases (62%; Table 2). Most benign breast epithelium was negative for PCDGF (25 of 26 cases, or 96%), as were most LCIS cases (11 of 12, or 92%). However, the majority of malignant noninvasive and invasive ductal lesions showed PCDGF expression. The difference in PCDGF expression between benign/LCIS and intraductal/invasive carcinomas was statistically significant (P = 0.001). Eighteen of the 27 DCIS (67%) and even a higher proportion of IDC, 99 of
Discussion
Our studies with human breast cancer cell lines have indicated the biological importance of PCDGF in breast cancer tumorigenesis,8, 9, 10 thereby warranting the investigation of its expression in archived pathological samples. This is the first report describing the expression of PCDGF in human breast tissue. We have shown that PCDGF is almost never expressed in benign breast epithelium. PCDGF expression was not seen in lobular carcinoma in situ, whereas the majority of invasive lobular
Acknowledgements
The authors thank Dr. Peter Watson, Ms. Michelle Parisien, and Linda Snell from the National Cancer Institute of Canada-Manitoba Breast Tumor Bank, funded by the National Cancer Institute of Canada (Winnipeg, Manitoba, Canada), for providing several of the IDC cases examined.
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Supported in part by grants 9857-AFF and BCTR-2000-356 from the Susan G. Komen Breast Cancer Foundation, grants DAMD17-01-1-0551 from the Department of Defense (Frederick, MD) and grants CA 85367 from the National Institutes of Health (Bethesda, MD).